:root {
    --navy: #002855;
    --navy-light: #003d7a;
    --star-blue: #4B9CD3;
    --bg: #fafbfc;
    --card-bg: #ffffff;
    --border: #e0e4e8;
    --text: #1a1a2e;
    --text-light: #666;
    --pill-bg: #f0f4f8;
    --filter-bg: #f5f7fa;
    --max-width: 1100px;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    overflow-y: scroll;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, system-ui, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--star-blue);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Hero */
.hero {
    background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);
    padding: 3rem 1.5rem;
    text-align: center;
    color: white;
}

.hero-logo {
    width: 72px;
    height: 72px;
    margin-bottom: 1rem;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin-bottom: 0.5rem;
}

.hero p {
    font-size: 1.1rem;
    opacity: 0.85;
    max-width: 500px;
    margin: 0 auto;
    line-height: 1.5;
}

/* Category Filter Bar */
.filter-bar {
    background: var(--filter-bg);
    padding: 1rem 1.5rem;
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    flex-wrap: wrap;
    border-bottom: 1px solid var(--border);
}

.filter-btn {
    background: var(--card-bg);
    color: var(--navy);
    border: 1px solid var(--border);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    font-family: inherit;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.filter-btn:hover {
    border-color: var(--navy);
}

.filter-btn.active {
    background: var(--navy);
    color: white;
    border-color: var(--navy);
}

/* Card Grid */
.card-grid {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1.5rem;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
}

@media (max-width: 720px) {
    .card-grid {
        grid-template-columns: 1fr;
    }

    .hero h1 {
        font-size: 1.8rem;
    }
}

/* Cards */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
}

.card-category {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--star-blue);
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 0.15rem;
}

.card-city {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.card-description {
    font-size: 0.875rem;
    color: #444;
    line-height: 1.5;
    margin-bottom: 0.75rem;
}

.card-features {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin-bottom: 0.75rem;
    list-style: none;
}

.card-features li {
    background: var(--pill-bg);
    color: var(--navy);
    padding: 0.15rem 0.6rem;
    border-radius: 10px;
    font-size: 0.75rem;
}

.card-access {
    font-size: 0.8rem;
    color: var(--navy);
    font-weight: 500;
    margin-bottom: 0.75rem;
}

.card-links {
    margin-top: auto;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.8rem;
}

.card-links a {
    color: var(--star-blue);
    font-weight: 500;
}

.card-links .social-links {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.card-links .social-links a {
    color: var(--text-light);
    font-size: 0.75rem;
}

.card-links .social-links a:hover {
    color: var(--navy);
    text-decoration: none;
}

/* Footer */
footer {
    background: var(--navy);
    padding: 1.5rem;
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.8rem;
}

footer a {
    color: rgba(255, 255, 255, 0.8);
}

footer a:hover {
    color: white;
}